If impacts look to be high but amounts may end up falling short of warning criteria, then the warning can be maintained (impact based warnings). This helps to keep messaging consistent given the high impact aspect. Now I will say that based on the latest forecast, ice amounts are no where near warning criteria for ice for some areas but a warning remains in effect. Changes could be coming through the afternoon. From a messaging standpoint for this storm, it does look odd that some places are under an ice storm warning while nearby areas are under a winter weather advisory with very similar ice amounts forecast. I can see some confusion about that.